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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9cae87693c6e2c5a66fa662a9b1c47cef1b7de57cc320fbd2ceacd93c143249' 
  AND token = 'WO/ModbNfXP0qDxTc4kl9Y++OXUfy54ndTlhBFwdNtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}